Humpbacks made the surface intervals more fun than the dives at the Mana Crack off Kauai's Na'Pali Coast. Our divemaster said we might summon the whales by slapping the water. It worked. Money shots at 1:15 and 2:45 (the latter during our second dive on the reef at 60'). Crank the volume for the last two minutes to hear the humpbacks chattering. We saw spinner dolphins and oceanic white tips on the trip, but nothing topped the whales.